Aeroflex 2050T SERIES, Operating Manual, Page: 238 / 322

ACCEPTANCE TESTING
6-35
Establishing IQ channel balance
(8) Set the UUT as follows:
[Q Ampli.] 500 mV [IQ Angle] 270 [enter]
(9) Set the spectrum analyzer as follows:-
Span/div 5 kHz
(10) Using the markers 1 and 2 facility on the spectrum analyzer, measure the amplitude of the
suppressed lower sideband relative to the upper sideband. See Fig. 6-22.
Fig. 6-22 Spectrum analyzer trace for IQ channel balance measurement
IQ channel balance = ______________ dBc (C)
Establishing channel frequency response errors
(11) Connect the test equipment as shown in Fig. 6-23.
C1667
UUT
INPUT
DVM
I IN/OUT
Fig. 6-23 Channel frequency response test set-up
(12) Enable the UUT IQ output in Test Tone Mode with a tone frequency of 1 kHz as follows:-
[SIG GEN] [Config. Select][IQ O/P Enable] [SIG GEN]
[Mod'n System][Tone Freq.] 1 kHz
(13) Set the DVM to measure AC volts and record the measured voltage:
Voltage V
1
= _____________ volts
(14) Set the UUT to [Tone Freq.] 25 kHz and record the measured voltage:
Voltage V
2
= ______________ volts